JOURNAL OF MICROMECHANICS AND MICROENGINEERING, vol. 18, no. 10, page. 105016 - 105016, 2008-10
NATURE, vol. 470, no. 7334, page. 399 - U152, 2011-02-17
JOURNAL OF PROPULSION AND POWER, vol. 29, no. 6, page. 1357 - 1366, 2013-11
PLoS ONE, vol. 10, no. 8, 2015-08-25